"outwardly visible" is grammatically correct and usable in written English.
You can use it to describe something which is visible from the outside. For example: The outwardly visible signs of aging were not as noticeable as she had feared.
My expression must've been strange as I sat in class, feeling hidden in my other place, but outwardly visible to whoever looked — not that many did.
The bridge deck used in the study contains significant delaminations but exhibits virtually no outwardly visible signs of these deficiencies, so a detailed visual inspection survey of the deck was not included.
Halderman said the hacking theory was "plausible" because other cyberattacks took place during the election campaign, some voting machines used in the US are highly vulnerable, and skilled hackers could change the result and "leave no outwardly visible evidence".
Tuesday's blast at unit 2 was not outwardly visible, but was potentially more dangerous than some of the earlier explosions, because it may have created an escape route for radioactive material bottled up inside the thick steel-and-concrete reactor vessel.
It encompasses the wired interiors of the London and New York headquarters, the embrace of videos, Skype-ing between design team and factory, as well as the more outwardly visible live-streaming and 3-D filming of recent shows and the "Art of the Trench," the Web site set up specifically to promote the iconic Burberry trench coat with the photo blogger Scott Schuman, known as the Sartorialist.
There are many more scientists exhibiting the bumps and bruises of the job market than there are scientists with an outwardly visible positive expectation.
I suppose I already knew that in 1970 women were often thwarted, and that social class was more outwardly, and painfully, visible than now.
Their visible injuries outwardly reflect the great danger they faced in defense of our freedom, but their resilient spirits sometimes mask other invisible – yet equally debilitating – wounds of war.
Still, this pales in comparison to what people of color, people with visible disabilities, people whose religion is outwardly represented by a garment on their person, and others whose identities cannot easily be hidden face each day, especially in the South.
Outwardly I look relatively healthy and young with no visible disabilities or special needs, but inside, I wasn't doing too great.
This idea, that emotions were external and visible effects, also explains why the term "sensible" (meaning outwardly observable) was so frequently applied to the term "emotion" in 18th-century texts (Diller, 2010, p. 150).
